Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22e8ab2a1fb0fced4f5f05a43bd44d0544603adf1bdfa8c9debac6a84207f78' 
  AND token = 'DW2OFhQ/S9aF8NttsDSCf8BW0sljBptnMMJiOyUy2Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}